Tool-holder.



G. AMBORN.

TOOL HQI-DBR. APPLICATION FILED FEBA 12, 1912.

1,120,783. atented Dec. 15, 1914.

2 SHEETS-SHEET 1.

* Rg j. ny 4.

IHHNHIIIVNIIIIIHIIIEHIIMVI(HIIHINIIHIII INVENTGR z G. AMBORN.

TOOL HLDBR.

APPLICATION FILED 513.12, 1912.

1 ,120,783. Patented Dec. 15, 1914.

2 SHEETS-SHEET 2.

"HMFilm1.

I INVENTOR ;v In-IM, l {gn/@IM I 5,1' A'Jfzawzeys,

UNITED STATESPATENT OFFICE.,

GEORGEIAMBORN, OF GHAPINVILLE, CONNECTICUT, ASSIGNOR T J.'-H. WILLIAMS & CO., 0F BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

TOOL-HOLDER.

Specification of Letters Patent.

Patented Dec. i5, 1914.-.

Application 'led February 12, 1912. i Serial No. 677,157.

The accompanying drawings illustrate embodiments of the invention.

Figure l is a longitudinal section; Figs. 2 and 3, sections on the lines 2--2 and 3-3 of Fig. 1 respectively; and Fig. 4 an end view of one embodiment of the inven tion; Fig. 5. is a longitudinal section of an other embodiment; Figs. 6 and'7 are respectively a longitudinal section and plan of still another embodiment; F igs.' 8 and 9 are respectively a longitudinal section and' plan of-still another embodiment. v

ReferringY now sito Ythe Yembodiments of the invention illustrated, the complete tool holding device comprises a shank A and a holder proper B, the tool C being clamped between the shank and the holder, with or without the intermediation of" other parts, asvhereinafter described. The Iholder .proper B embraces the top and bottom of the tool C, and extends backward tol form a stud D (Fig. l) which fits loosely as shown into an opening E passing from front to rear through the shank, and extends through at the back of the shank where it 1s provided with a screwthreaded end F upon which is a nut G bearing against a washer H which has a convex face bearing against a concave face on the/rearof the shank. Or the clamping'may be eected by using a stud D (Fig. 6) which is hollow and internally screwthreaded, and which is engaged by a screw F having thereon a head G bearing against a washer H which'in turn bears against the rear face of the shank.

There is sometimes a variation or lack of parallelism between the outer and. inner yfaces of the cutter. In order that this lack of-parallelism shall not introduce bending strains in .the clamping devices, I provide of the rocker.

collar K which-bears against the forward o5 face of the shank. Now when the nut G is turned and a clamping strain -is put on it, Athe tool bears inwardly against the rocker J, and the latter will rock suioiently to make a perfect contact or bearing against the tool, and at thev same time its convex rear face will form a good bearing against the collar K, and through this collaragainst the shank. The rocker J is provided with a pin L' entering loosely a socket in the end of the 75 stud D, which will prevent' the detachment This will save the rockers being lost in the manipulation of the holder to introduce and withdraw a tool. The

clamping face of the rocker, that is to say,

face provided with radial grooves and projections M which interlock with similar grooves and projections on'the forward face lof the shank A. The projections on these parts are triangular in cross-section, so that the collar 'will automatically find its way into interlocking position, thus insurin proper engagement when a tool is clampe in place.

i By setting the collar K and with it the rocker J and holder proper B in the desired angular position, ,the tool is correspondinglyset. Such a provision for an'gular adjustment is not an essential feature of. the device, though preferable.

Fig. 5 shows a construction the saine as Figs. 1 to 4, with the addition'of an outer rocker QJZ betweenv the holder proper and the outer face of the cutter- C. The rocker J2 is loosely mounted in the holder B by 110 means of ins N on the sides of the rocker entering oosely into openings O in the side arms of the holder so as to prevent loss of the rocker, and at the same time to permit it to freely adjust itself to the clamplng face of the tool. This construction allows for a slight angular adjustment of the outer end of the tool toward and away from 'the shank. For this purpose the tool may be held in any angular position desired, the rockers J and J2 adjusting themselves accordingly and the holder being then clamped.

Figs. 6 and 7 show a construction similar to that of Figs. l to 4. The rocker J3, however, rests directly against the shank A, the latter being provided with a series of radial slots P.' For effecting an angularl adjustment of the tool the rocker J3, and with it the holder B, are turned so as to drop the rocker into the desired slots I. This makes a positive lock like that made by the projections M of Figs. 1 to 4, though it does not allow of as nice adjustment; and

the angular projections M automatically insure a proper locking engagement of the parts, while the square-edged grooves P do not automatically fall into engagement with the rocker. The rocker might possibly be fastened in a position where it does not engage one of the grooves l), and might thus give trouble when strain is put on the cutter. The rocker J3 is held in lace by means of the pins Q, projecting rom its sides and embracing one of the side arms of the holder B.

In Figs. 8 and\9 a collar K has a slot across its outer face for direct engagement of the tool C, and has line triangular radial teeth M for engagement with similar radial teeth on the shank, whereby a nice angular adjustment can be effected and the engagement is made automatic as above explained. A rocking movement of the holder proper B is permitted by making the stud F2 loose in the shank, and by the use of the convex washer H2 so as to permit the relative rocking movement of the clamping faces desired to cause them to take an even bearing upon the opposite faces of the tool. The washerI-I2 is made integral with the nut G2 in the construction illustrated; but it may be separate, as in the previous figures. With respect to the rocking capability of the holder proper this construction is similar to that of Figs. 1 to 5. But in this construction the bearing of the lower edge of the tool is fixed and there is no rocker such as J or J2, and as the tool is clamped' the holder proper B will necessarily rock so as to come to a flat bearing on the upper edge of the tool; whereas in the devices of Figs.

1 to 5 the rocker or rockers J and J2 Wllll ordinarily adjust themselves to the edges of the tool, and the loose fit of the stud D in the opening E through the shank together with the convex bearing face of the washer II will serve chiefly to ease any transverse strain upon the stud by permitting a slight rocking movement of the holder proper relatively to the shank Whenever necessitated by the occurrence of such a strain.

1. 'A tool-holding device including in colnbination a shank and a holder proper between which a tool is to be clamped, said holder havin@ a slot through which the tool is passed and having a threaded stud extending through the shank, and a nut engaging said stud and bearing against said shank by which the holder is drawn toward the shank to clamp the tool in place, said holding device being adapted to permita slight rocking of the opposite clamping facesrelatively to each other so as to adjust them 'sel-ves automatically to an even bearing against the opposite sides of the tool as said stud is drawn up by said nut.

2. A tool holding device comprising in combination a shank and a holder proper between Which a tool is to be clamped, said holder being adapted to rock so as to adjust itself to the face of the tool.

3. A "tool-holding device including in combination a shank and a holder proper between which a tool is to be clamped, said holder having a slot through which the tool is passed and having a threaded stud eX- tending through the shank, and a nut engaging said stud and bearing against said shank, by which the holder is drawn toward the shank to clamp the tool in place, said holder being adapted to rock so as to adjust itself to the face of the tool.

LLA tool-holding device including in combination a shank A having a transverse Aopening through its end and a holder proper B, between which shank and holder a tool is to be clamped, said holder having a stud F2 passing loosely through said opening and having a slot substantially parallel with the shank and through which the tool passes, said stud being threaded at its end, and a nut on said end having a rocking bearing against the shank by which the holder 'is dDraWn toward the shank to clamp the tool in place and is adapted to rock so as to adjust itself to the'face of the tool. In Witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

GEORGE AMBORN. Witnesses:

CHARLES B. HARRIS, WmLIAM GCoLE. 

